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The Fearless Defenders was an ongoing comic book series published by Marvel Comics that debuted in February 2013 as part of the company's Marvel NOW! initiative. The series, written by Cullen Bunn with artwork by Will Sliney, centered on the Valkyrior, a team of female superheroes led by Valkyrie and Misty Knight. Despite favorable reviews from critics, the series ended in December 2013 after thirteen issues due to poor sales.

In May 2012, writer Cullen Bunn stated that the concept of the series came to him while scripting the fifth or sixth issue of Fear Itself: The Fearless, which also starred Valkyrie. Bunn said he was campaigning for the book following the conclusion of Fear Itself: The Fearless, when an editor pitched the idea of doing it as a Defenders title. However Bunn explained that beyond the name there is "little connection" to the Defenders. In November 2012, Marvel Comics teased the announcement of The Fearless Defenders by releasing an image of the word "Fearless" with the creative team of Bunn and artist Will Sliney. A week later, Marvel made the full announcement. Bunn said, "The basic idea of the book is that Valkyrie is choosing a new team of Valkyrior, and she's been asked to choose all these women from the heroes of Midgard (Earth), instead of from Asgard". Bunn also said that Misty Knight co-stars in the series, "They're our co-leads, and the rest of the team will build around them. I think it'll be interesting to see how the two of them see things differently. You've got Misty, who's a very street-level character. And you've got Valkyrie, who's a goddess". Dani Moonstar was revealed as the third member of team. Bunn said, "She has such a connection to the Valkyrie. She was on the top of my list when I started putting together who I thought would be the core roster".